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-rw-r--r--include/pugl/glu.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/pugl/glu.h b/include/pugl/glu.h
index 423a917..b67b7a0 100644
--- a/include/pugl/glu.h
+++ b/include/pugl/glu.h
@@ -22,6 +22,9 @@
pure portable programs.
*/
+#ifndef PUGL_GLU_H
+#define PUGL_GLU_H
+
// IWYU pragma: begin_exports
#ifdef __APPLE__
@@ -34,3 +37,5 @@
#endif
// IWYU pragma: end_exports
+
+#endif // PUGL_GLU_H